Cullman County is a county located in the north central portion of the U.S. state of Alabama. As of the 2020 census, the population was 87,866. Its county seat and largest city is Cullman. Its name is in honor of Colonel John G. Cullmann.

Cullman is the largest city and county seat of Cullman County, Alabama, United States. It is located along Interstate 65, about 50 miles (80 km) north of Birmingham and about 55 miles (89 km) south of Huntsville. As of the 2020 census it had a population of 18,213, with an estimated population of 19,251 in 2022.